On your smartphone, check if notifications are enabled for the Home + Security app. Note: Some Android manufacturers limit the functionality of background apps to maximize battery life. This may prevent you from receiving notifications for the Home + Security apps. You can find different solutions in the following link: https://dontkillmyapp.com/ (Legrand Netatmo Bticino is not responsible for the content of this page) Also, keep in mind that a poor Wi-Fi signal can also cause notification issues.